Pause the Game if there is a AFK
Allow me to elaborate...
If someone AFK'd we could implement a feature that pauses said game until they get back or 5mins go by. If the time expires the game will end and result in a "Tie" and the player who AFK'd will be auto reported by the system AND if this is ranked they will drop in -50 LP provided they are lower then gold. If they are higher then gold they will drop by a tier. IE: If a Diamond 1 AFK'd they'd suffer the consequence and auto demote to Diamond 2 0LP even if they are in promos or at Diamond 1 99 LP. This should help prevent AFKing players from climbing up and AFKing at all.
Please if you're network connection is bad make a better decision in life. Don't be THAT player. ;)
Imagine, You are in your ranked game and there is someone dealing with network issues and so the game paused until they get back or 5mins pass by. No remake needed, it'd end in a tie. In some cases ppl don't even get to remake because of a tiny loop hole in the system. This idea should fix it all up.
Fortunately if Riot Games did implement this feature anyone who was reported by this new system would probably suffer from a hard ban, maybe even a IP/MAC Address ban. This could be disputable in the player support section of the site, and I would doubt it would be permanent unless more reason was given.